The makefile as provided by Fluent assumes compilation for "native" architecture. (If you look at the compile report being generated, you will see a warning to such effect).

A workaround is to add-xtarget=<target>to the variable CCFLAGS_ULTRA. e.g. to compile for 6500 servers or any other sun machines based on the SPARC-II processor, setCCFLAGS_ULTRA = -KPIC -fast -v -Xc -xtarget=ultra2

This library works on both the SPARC-III machine, as well as the SPARC-II machine. Note: this library is to be compiled on the SPARC-III machine.